Electric motor.



H. MI TLLER. ELECTRIC MOTOR. APPLICATION FILED AUG.29, 1907.

953,219. I Patented Mar. 29, 1910.

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gwi HEZZVHZCH MULLER.

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subject of the King Berlin, No. 58, Germany, have invented cer trioMotors,

ing-tables in rolling mills, Y la'ting motors in electric hoist systems.

all such motors,

supplied vis transformed into heat, so that h UNITED STATES PATENTOFFICE.

. HEINRICH MULLER, 0F IBERLIN,- GERMANY, ASSIGNOR TO GENERAL ELECTRICCOMPANY, A CORPORATION OF NEW YORK.

ELECTRIC oron.

Specification of Letters Patent.

Patented Mar. 29, 1910.

Application filed August 29, 1907. Serial No. 390,626.

To all whom it may concern:

Be it known that I, HEINRI H MI'iLLER; a of Prussia, residing at tainnew.and useful Improvements in Elecof which the following'is aspecification.

My invention relates to an electric motor having two rotatable members,one fastened to the shaft and the other free to rotate.

More specifically my invention relates to an electric motor with tworotatable members, one of which is fastened to the shaft and the otheris-free to rotate and drives a ventilator.

-My device is particularly adapted to inwhich are frequently used stillunder current but exert a balancing torque, such as those used forreleasing brakes in cranes, the lifting motors for liftor the slip-regu-In all of the electrical energy the types used must bedisproportionately large and costly, in order that the heating may bekept within permissible limits.

By the use ofmy invention good ventilation is supplied the motors,making it possible to use sma'llerand cheaper machines.

The essence'of my invention consists in the feature that the rotor'whosetorque is to be utilized is divided into two unequal parts situatedside-by side, the smaller of which, orm'ed as a ventilator, is free torotate upon the common shaft. The larger art of the rotor is designed toexert a arge torque, and is' provided with ventilating ducts orchannels. Under the influence of the rotating field created in thestator, the larger stationary part of the rotor exerts .the desiredtorque, while the smaller part, being free to turn, rotates according tothe rotary field, and'blows air through the ducts or channels abovementioned, this continuing as long. as the stator is in circuit, that;is as long as the motor is required to exert torque.-

For a better understanding of my invention reference may be had to thedrawings in whichv my invention is applied to an induction motor, ofwhic'h Figure 1 is a vertical section; Fig. 2 is a view of the rotor atright angles to that shown in Fig. 1 and shows the two rotors, half ofthe one formed as a ventilator being cut away; and Fig. 3 is an enlargedView of the fan.

1 is the stator with the windings 8. The rotor 2 has air ducts 4 and iskeyed to the shaft 6,- w'hich exerts the torque. The rotor 3, of smallmass isfastened to the fan 5, both of which are free to rotate on theshaft 6. The fan as illustrated is made of a punching 7 but fan bladescould be mounted 1 directly on the rotor 3.

as applied to an induction motor, it is evident that it may be used inconnection with any. electric notor. Asa ventilating device it may beused with motors which are braked while current is still supplied to thewindings, or which have the current reversed m t eir windings to brakethem. I

What I claim as new and desire to secure by Letters Patent of the UnitedStates, is,-

1. In an electric motor, two rotatable members situated side by side,one fastened to and' the other free to rotate about the shaft, and aventilator driven by'the latter member. I

2. In an electric motor, two rotatable members situated side by side,one fastened to and the other free to rotate about the shaft, the lattermember being provided with fan blades.

3. In an induction motor, a stator and two rotors, said rotors situatedside by side one being fastened to and the other free to rotate aboutthe shaft, and a ventilator driven by the latter member.

4. In an induction motor, a stator and two rotors, said rotors situatedside by side .one being fastened to, and the otherfree to rotate aboutthe shaft, the latter member being provided with fan blades.

5. In an induction motor, a stator and two rotors, one being fastened tothe shaft and provided with air ducts, and the other by t e lattermember, said ventilator regis tering with said air ducts.

6. In an induction motor, a stator and 5 two rotors, said rotors beingsituated side by side, a shaft, one of said rotors being fastened to andthe other free to rotate about said shaft, said rotor fastened to theshaft being provided with air ducts, and a ventibeing free to rotate,and a ventilator driven lator driven by the rotor free to rotate about10 the shaft said ventilator registering with said air ducts.

In witness whereof, I have hereunto set my hand this tenth day of August1907. v

HEINRICH MULLER.

Witnesses:

JULIUS RiiNDANT, Osmn SINGE

